Dan Ariely has some truely amazing and shocking revelations on his site here, but since I have spent the last few months trading I was particularly interested in these 2 articles,
http://www.psychologytoday.com/blog/predictably-irrational/200907/the-value-advice
http://www.psychologytoday.com/blog/predictably-irrational/200907/were-more-swayed-confidence-expertise
The bottom line is, advice from sources we presume to be more informed than us pretty much shuts down our brains own decision making machinery.
Also, we find confidence far more seducing than expertise.